Process of manufacturing sodic-silico aluminate and hydrochloric acid.



1 UNITED sTA Es PATENT OFFICE.

AL R D a. oownns, F snwan'nn,

New JERSEY, AND anon? KAYSER, nncnasnn, IBY

GRACE KAYSER- ADMINISTBJLTRIK, OF LOCKPORT, NEW YORK, ASSIGNORS T0 ELECTRIC SMELTING AND ALUMINUM COMPANY, OF LOCKPORT,

rao'cnss' or manuracruamoscore-sumo ALUMINATE AND HYDROCHLORIC ACID.

No Drawing.

Specification of Letters Patent.

Patented; Oct 15, 1912.

Be it'known that we, ALFRED H. Cownns and GRACE KAYSER, administratrix of the estate of AnoLr KAYsnR, deceased, both citizens of the United Stat-es, residing, respectively, at- Sewaren, county of Middlesex, and State of New Jersey, and Lockport', county of Niagara, and State of New invented a certain new and useful Improvement in Processes of Manufacturing Sodic Silico Aluminate and Hydrochloric Acid, of

which the following is a full, clear,-and ex .act description.

The present invention relates to the manufact-ure of sodic-silico aluminate and hy-,

drochlori'c acid. The object of the,invention has been to improvethe vmanufacture ofthese compounds so that the processshall be under better control with les. waste and more uniform products.

The above object it will be seen is at-' tained by the embodiment of our invent-ion described in the following specification.

As is well known, 1111113 high. temperature. vThe alkaline oxid formed through the reaction of the steam upon the chlorid combines with silica or alumina or both, as the case may be, while the chlorin unites with the hydrogen of the steam to form hydrochloric acid.

The method of procedure which forms the subject of the present application is an improvement upon the method described in the U. S. Patent No. 376,409, January 10, 1888 in which is described the arrangement of bricks of the reacting material ina furnace fed by steam and a heating flame from the top, the waste products and gaseous hydrochloric acid formed being drawn from the bottom. p v

Our improved procedure in its broadest aspect is applicable to such a mixture of materials as are set forth in that patent. but it is of especial value when that mixture is modified by introducing a certain amount of carboniferous material. preferably 3 to 10 per cent. The mix is formed into bricks of different size or the same external dimensions with perforations therethrough. The bricks are then placed in a down draft fur- York, have V in the lower silica as Well as aluor both combined will, in the presence of steam, decompose alkaline chlorids at a 1 Application filed June 23, 1911. Serial No; 635,050.

, nace to which burning gases and, steam are admltted from above.

The charge is so arranged in this furnace per cubic unit at the bottom is less than at the top. This result may be achieved by placing perforated bricks'at the bottom of the charge or by using smaller bricks with substantially the same interspacing as" employed at the top, and we'prefer that-this graduation from top to, bottom be uniform and gradual. We findthat'by this arrangement the progress of the zone of action through the furnace can be controlled so that the bricks at the bottom of the furnace are finished at substantially the same time as those at the: top. This is an important practical advantage, since it has been found practising the older processes that the bricks in the upper part of the charge become thoroughly converted while the bricks part are but yet partially changed, so that it has been necessary to draw the charge in a partially finished condition. Furthermore, chemical difficulties have been such as to prevent the older processes from being forcedor hastened so as to cause the reacting zone to advance to the bottom of the furnace quickly enough to cause the bricks therein to be finished anywhere near contemporaneously' with those in the upperportion of the furnace. V

The reason for the improved results achieved by our arrangement is that the reaction effeoted by the steam upon the solid mass of the bricks is initially a superficial one and the rate of its progress into the mass of each brick is dependent upon the gradual penetration-of the steam and sufiicient heat to effect the reaction. At the beginning of the process the zone of reaction will extend only to such depth in the furnace as the supply of heat will permit considering the superficial area presented by the mass of material within the zone. As the reaction progresses from-the outside faces into the lnterior of a brick the area involved in rethat the actual mass the mechanical and action in such individual brick becomes less and consequently the total surface under action within the original depth of the reacting zone will become less. Therefore more heat will be available for extending the furnace zone downward.

- may be adjusted in suchmanner that the If the bricks in the lower part of the furnace present the same mass per cubic unit to the reagent gases, .as is the. case in the former processes, the result is that the reaction is completed in the bricks at the upper part of the furnace before the bricks in the lower part have been more thanpartially converted. If, however, the mass of the bricks er cubic unit of contents is diminished toward the bottom of the furnace, the furnace zone of reaction spreads rapidly after the partial conversion ofthe-bricks in the'upcalm the matters of heat, waste, and incompletely converted bricks. The carboniferous material as it is consumed in the treatment of the chargecauses a reduction to take place much more quickly and thoroughly than could be accomplished by treatment of thematerial with a reducing gas acting externally, and furthermore, the admixture of carbonaceous materialnecessi- ,tatesthe use ofonly suflicient gas to give the necessary heat. Therefore air may be introduced with the gas which will result in creating substantially 'an oxidized atmosphere surrounding the material being treat-- ed, andthis prevents an excessive reduction copies of this patent may be obtained for five cents each, by addressing the .charge per to bottom,

nes'ses.

of the outer surface of the material which usually obtains where a gas alone acts as thereducing agent.

Having thus described our invention, we

claim: a g

1. The herein described method which comprises arranging bricks containing kaline chlorid and a compound containing alumina and silica so that the mass of the cubic unit decreases from top and forcing through the charge from top to bottom steam and the flame from a gaseous fuel. 2. The herein described method which comprises arranging bricks of the material to be treated so that the mass of the charge per cubic unit decreases from top to bottom of the charge and forcing through the charge from top to bottom a stream of gaseous material adapted to react-with. the

char e. g

3. .[he herein described method which comprises arranging segregated masses of material to be treated-so that the quantity of material per cubic unit decreasesgraduallyfrom the top toward the bottom and forcing through the charge from the top to the bottom a stream of gaseous material adapted to react with the c arge.

In testimony whereof, we hereunto aflix our signatures in thepresence of two wit- ALFRED COWLES.

GRACE KAYSER,

' Admz'aistratrim of the estate of Adolf K ayser.

Oowles:

ALBERT STETSON, CYRUS D. Huronmson. V

Witnesses to signature of Grace Kayser:

E. J. DAVIS, f C. B. TRAVIS.

Witnesses to signature of A1 fred. H.

Commissioner of raten ts,

Washington, D. 0. 

